CN101640751B - Image reader, auto document feeder, and image forming apparatus - Google Patents

Image reader, auto document feeder, and image forming apparatus Download PDF

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Publication number
CN101640751B
CN101640751B CN200910159668XA CN200910159668A CN101640751B CN 101640751 B CN101640751 B CN 101640751B CN 200910159668X A CN200910159668X A CN 200910159668XA CN 200910159668 A CN200910159668 A CN 200910159668A CN 101640751 B CN101640751 B CN 101640751B
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China
Prior art keywords
mentioned
read
guiding
scanning direction
roller
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Expired - Fee Related
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CN200910159668XA
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Chinese (zh)
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CN101640751A (en
Inventor
佐野元哉
藤井隆
久保宏
北冈真也
赤井武志
兼谷厚志
松下慎吾
木村宪雄
森田健一郎
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Ricoh Co Ltd
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Ricoh Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/12—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using the sheet-feed movement or the medium-advance or the drum-rotation movement as the slow scanning component, e.g. arrangements for the main-scanning
    • H04N1/121—Feeding arrangements
    • H04N1/1215—Feeding using one or more cylindrical platens or rollers in the immediate vicinity of the main scanning line
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00567—Handling of original or reproduction media, e.g. cutting, separating, stacking
    • H04N1/0057—Conveying sheets before or after scanning
    • H04N1/00588—Conveying sheets before or after scanning to the scanning position
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00567—Handling of original or reproduction media, e.g. cutting, separating, stacking
    • H04N1/0057—Conveying sheets before or after scanning
    • H04N1/00599—Using specific components
    • H04N1/00602—Feed rollers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00567—Handling of original or reproduction media, e.g. cutting, separating, stacking
    • H04N1/0057—Conveying sheets before or after scanning
    • H04N1/00599—Using specific components
    • H04N1/0061—Feed belts
    • H—ELECTRICITY
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    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
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    • H04N1/00567—Handling of original or reproduction media, e.g. cutting, separating, stacking
    • H04N1/0062—Removing sheets from a stack or inputting media
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00567—Handling of original or reproduction media, e.g. cutting, separating, stacking
    • H04N1/00649—Control or synchronising different handling operations
    • H04N1/00652—Control of feeding speed, e.g. fast feeding to scanning position
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00681—Detecting the presence, position or size of a sheet or correcting its position before scanning
    • H04N1/00684—Object of the detection
    • H04N1/00687—Presence or absence
    • H04N1/00689—Presence
    • H—ELECTRICITY
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    • H04N1/00681—Detecting the presence, position or size of a sheet or correcting its position before scanning
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    • H04N1/00694—Presence or absence in an input tray
    • H—ELECTRICITY
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    • H04N1/00681—Detecting the presence, position or size of a sheet or correcting its position before scanning
    • H04N1/00684—Object of the detection
    • H04N1/00702—Position
    • H04N1/00705—Position at a plurality of spaced apart locations, e.g. as a sheet is fed through the apparatus
    • H—ELECTRICITY
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    • H04N1/00681—Detecting the presence, position or size of a sheet or correcting its position before scanning
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    • H04N1/00708—Size or dimensions
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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    • H04N1/00681—Detecting the presence, position or size of a sheet or correcting its position before scanning
    • H04N1/00684—Object of the detection
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    • H04N1/00713—Length
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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    • H04N1/00681—Detecting the presence, position or size of a sheet or correcting its position before scanning
    • H04N1/00729—Detection means
    • H04N1/00732—Mechanical detectors
    • H—ELECTRICITY
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    • H04N1/00681—Detecting the presence, position or size of a sheet or correcting its position before scanning
    • H04N1/00729—Detection means
    • H04N1/00734—Optical detectors
    • H—ELECTRICITY
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    • H04N1/00681—Detecting the presence, position or size of a sheet or correcting its position before scanning
    • H04N1/00742—Detection methods
    • H04N1/00745—Detecting the leading or trailing ends of a moving sheet
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    • H04N1/00742—Detection methods
    • H04N1/0075—Detecting a change in reflectivity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00681—Detecting the presence, position or size of a sheet or correcting its position before scanning
    • H04N1/00742—Detection methods
    • H04N1/00755—Detecting an interruption of light
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00681—Detecting the presence, position or size of a sheet or correcting its position before scanning
    • H04N1/00763—Action taken as a result of detection
    • H04N1/00774—Adjusting or controlling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00681—Detecting the presence, position or size of a sheet or correcting its position before scanning
    • H04N1/00763—Action taken as a result of detection
    • H04N1/00774—Adjusting or controlling
    • H04N1/00782—Initiating operations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/12—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using the sheet-feed movement or the medium-advance or the drum-rotation movement as the slow scanning component, e.g. arrangements for the main-scanning
    • H04N1/121—Feeding arrangements
    • H04N1/125—Feeding arrangements the sheet feeding apparatus serving an auxiliary function, e.g. as a white reference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/203—Simultaneous scanning of two or more separate pictures, e.g. two sides of the same sheet
    • H04N1/2032—Simultaneous scanning of two or more separate pictures, e.g. two sides of the same sheet of two pictures corresponding to two sides of a single medium
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/19—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays
    • H04N1/191—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays the array comprising a one-dimensional array, or a combination of one-dimensional arrays, or a substantially one-dimensional array, e.g. an array of staggered elements
    • H04N1/192—Simultaneously or substantially simultaneously scanning picture elements on one main scanning line
    • H04N1/193—Simultaneously or substantially simultaneously scanning picture elements on one main scanning line using electrically scanned linear arrays, e.g. linear CCD arrays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/0098—User intervention not otherwise provided for, e.g. placing documents, responding to an alarm

Abstract

The invention relates to an image reader, an auto document feeder, and an image forming apparatus. The invention has the object that even if the opposite guide part of the reading member is adhered with dirt, it is not influenced so as to obtain the accurate shading data. In the image reader, a reading member fixedly mounted in the image reader reads an image on a sheet conveyed into the image reader. A guide is disposed opposite the reading member to support the sheet with respect to the reading member. A guide moving member moves the guide with respect to the reading member in a main scanning direction in which the reading member reads the image on the sheet. A guide rotating member rotates the guide in a sub-scanning direction perpendicular to the main scanning direction. A controller controls the reading member to scan different positions on the guide moved by the guide moving member and rotated by the guide rotating member to generate shading data.

Description

Image read-out, auto document feeder and image processing system
Technical field
The present invention relates to image read-out, auto document feeder and image processing system; Be particularly related to the such image read-out of the following stated; Be provided with the automatic scanning apparatus of this image read-out, and the image processing system that is provided with this automatic scanning apparatus.Said image read-out comprises read means; This read means fixed configurations is used to read the paper of conveying at device body, with this read means subtend configuration; With the suitable position of the above-mentioned paper above-mentioned relatively read means of configuration; Simultaneously, above-mentioned read means has the function as amending plates that is used to read the shading value data, is used for above-mentioned reading mechanism and reads shading value data (shading data).
Background technology
Generally, read mode as the image that reads original image and have two kinds.First kind of mode is to make and read the position and move to drive moving body on one side; Read " scan pattern " of the original copy on the contact glass on one side; Carry out image and read, the second way is the still image reading part, makes the what is called " paper passes through type " of carrying by certain speed as the original copy of reading object.Again, in this image read-out,, need read datum plate, obtain the shading value data for the view data that reads is carried out revisal.
When obtaining the shading value data, contaminated if rubbish etc. is adhered in the datum plate part, just can not obtain correct shading value data.So, in first kind of mode, moving body is moved, the generation position of shading value data on the datum plate that staggers, the read value that pollution place will not take place is obtained (with reference to patent documentation 1) as the shading value data.
But, in being fixed in the mode of device body, the place of reading is moved.Therefore, if generate the shading value data that use with the guiding parts setting of reading part subtend on adhere to dirt such as rubbish, the shading value data of then adhering to the dirt part become exceptional value, shading value revisal problem can not be normally carried out in existence.In order to tackle such situation following image read-out is proposed.
The device of record in patent documentation 2; But the pivoting part that is provided with white reference plate, white reference plate and is the arm that links under the turn state of center, is integrally formed with arm with the point; And the motor of driving rotational parts, except that reading the white reference data, above-mentioned white reference plate is placed etc. the position beyond the position of reading of times imageing sensor; When reading the white reference data, the white reference plate is moved to etc. on times imageing sensor.
The device of record in patent documentation 3; The subtend guide that reads that is equivalent to datum plate is made up of roller; Be divided into a plurality of groups to the data that read one week of roller; Detection peak, obtain have peak-peak group in mean value as the shading value data, also can avoid its influence even dirt is adhered in the part of roller.
[patent documentation 1] spy opens the 2002-185725 communique
[patent documentation 2] spy opens flat 07-107283 communique
[patent documentation 3] spy opens the 2003-060907 communique
Yet; The device of record in the patent documentation 2, though the guide plate that when reading original image, subtend portion is provided with keep out of the way to prevent to be stained with dirt, be to use the image read-out of closed jointing transducer have the depth of focus shallow read characteristic; Therefore; Need get the distance setting of the glass cover of closed jointing transducer and original copy very narrow and smallly, in order to make above-mentioned guide plate in narrow and small interval, turn round, have the problem that requires very strict element precision.
Again, the device of record in patent documentation 3, if having a roller full week all be stained with dirt, so just can not generate the problem of correct shading value data.
Summary of the invention
The present invention puts forward in order to address this is that; The objective of the invention is to, even provide a kind of subtend guiding parts of read means to adhere to dirt, also can not receive it to influence, obtain image read-out, original document reading apparatus and the image processing system of suitable shading value data.
In order to solve above-mentioned problem, the present invention proposes following technical scheme.
(1) a kind of image read-out is characterized in that, comprising:
Read means, fixed configurations are used to read the paper of carrying in device body;
The guiding means with this read means subtend configuration, support, and make the above-mentioned relatively read means of above-mentioned paper be configured in correct position;
The guiding mobile means, the main scanning direction of the above-mentioned read means in edge drives above-mentioned guiding means, makes above-mentioned guiding means move relative to above-mentioned read means;
The guiding rotary tool makes the above-mentioned guiding means edge sub scanning direction vertical with main scanning direction turn round;
Controller is controlled above-mentioned read means, and scanning is moved by above-mentioned guiding mobile means and by not the existing together of the rotating guiding means of above-mentioned guiding rotary tool, generated the shading value data.
(2) in above-mentioned (1) described image read-out, it is characterized in that:
Above-mentioned guiding means comprise the datum plate by read means scanning, so that generate the shading value data.
(3) in above-mentioned (1) or (2) described image read-out, it is characterized in that:
Above-mentioned guiding means are to have the roughly roller shape parts of the surface concentration of homogeneous.
(4) in any described image read-out of above-mentioned (1)-(3), it is characterized in that:
Above-mentioned guiding mobile means makes above-mentioned guiding means move along main scanning direction, and above-mentioned guiding rotary tool makes above-mentioned guiding means turn round along sub scanning direction.
(5) in any described image read-out of above-mentioned (1)-(4), it is characterized in that:
Above-mentioned guiding mobile means makes above-mentioned guiding means along the amount of movement of main scanning direction, is at least 2 times amount of 1 of the base resolution of above-mentioned read means.
(6) in any described image read-out of above-mentioned (1)-(5), it is characterized in that:
When first of set plurality of sheets of paper opens the beginning when carrying, above-mentioned guiding mobile means makes above-mentioned guiding means move along main scanning direction.
(7) in above-mentioned (4) described image read-out, it is characterized in that:
Above-mentioned guiding mobile means makes the interval of moving between many paper that transports and read in proper order of above-mentioned guiding means carry out.
(8) in any described image read-out of above-mentioned (1)-(7), it is characterized in that:
The above-mentioned controller rotary tool of control guiding independently respectively makes above-mentioned guiding means make above-mentioned guiding means move along main scanning direction along sub scanning direction revolution and control guiding mobile means.
(9) in above-mentioned (8) described image read-out, it is characterized in that:
When first of set plurality of sheets of paper opens the beginning when carrying, above-mentioned controller control makes above-mentioned guiding mobile means separate with the guiding rotary tool, makes above-mentioned guiding means move along main scanning direction.
(10) in above-mentioned (8) described image read-out, it is characterized in that:
When first of set plurality of sheets of paper opens the beginning when carrying, above-mentioned controller is controlled above-mentioned guiding mobile means makes above-mentioned guiding means move along main scanning direction, and simultaneously, these guiding means are by guiding rotary tool driving rotational.
(11) in above-mentioned (8) described image read-out, it is characterized in that:
When read means read the paper epigraph, above-mentioned controller control guiding rotary tool made above-mentioned guiding means turn round along sub scanning direction, and the guiding mobile means does not make above-mentioned guiding means move along main scanning direction;
Above-mentioned controller control makes above-mentioned guiding mobile means separate with the guiding rotary tool, and above-mentioned guiding mobile means makes the interval of moving between many paper that transports and read in proper order of above-mentioned guiding means carry out.
(12) in above-mentioned (8) described image read-out, it is characterized in that:
When read means read the paper epigraph, above-mentioned controller control guiding rotary tool made above-mentioned guiding means turn round along sub scanning direction, and the guiding mobile means does not make above-mentioned guiding means move along main scanning direction;
Above-mentioned controller is controlled above-mentioned guiding mobile means makes above-mentioned guiding means move along main scanning direction, and carry out at the interval between many paper that transports and read in proper order, and simultaneously, these guiding means are by guiding rotary tool driving rotational.
(13) a kind of auto document feeder is characterized in that:
Be provided with any described image read-out in above-mentioned (1)-(12).
(14) a kind of image processing system is characterized in that:
Be provided with the auto document feeder described in above-mentioned (13).
Effect of the present invention is described below.
According to image read-out involved in the present invention, auto document feeder and image processing system; Can move the guiding means that double as is an amending plates through the guiding mobile means; Therefore, if adhere to dirt on the guide plate, can read the shading value data in other positions that are not stained with dirt.
Description of drawings
Fig. 1 is the sectional view that the summary of expression automatic scanning apparatus constitutes.
Fig. 2 is the control block diagram of automatic scanning apparatus.
Fig. 3 is the control block diagram of automatic scanning apparatus.
Fig. 4 is the block diagram of the formation example of the white shading value correcting circuit of expression.
Fig. 5 is the sketch map of handling in the expression averaging circuit.
Fig. 6 representes the travel mechanism of leading, and wherein, (a) and (b) are plane graphs that the operate condition of roller is read in expression second, (c) are the amplification stereogram of cam part.
What Fig. 7 represented that another example relates to second reads roller, and wherein, (a) and (b) are plane graphs of expression operate condition, (c) are the stereograms that roller is read in expression second.
Fig. 8 is that the flow chart of the mobile control of roller is read in expression second.
Fig. 9 be the expression second read roller mobile control second the example flow chart.
Figure 10 be the expression second read roller mobile control the 3rd the example flow chart.
Embodiment
Other purpose and characteristic of the present invention, the explanation according to reference to the example of the hereinafter of accompanying drawing will become clear and definite.
Below, the preferable example of the image read-out that present invention will be described in detail with reference to the accompanying relates to, auto document feeder, image processing system is in following example; Though to inscape, kind, combination; Shape, configuration waits and has done various qualifications relatively, still; These are only given an example, and the present invention is not limited thereto.
[embodiment]
Present embodiment is to be applicable to carry to fixing reading device portion being read original copy, with certain speed carry on one side, carry out the automatic scanning apparatus (following also note is made " ADF ") that image reads on one side.Below its basic formation of explanation, action, effect.Fig. 1 is the sectional view that the summary of expression automatic scanning apparatus constitutes, and Fig. 2 and Fig. 3 are the control block diagrams of automatic scanning apparatus.
Automatic scanning apparatus is made up of following each several part: the original copy of folding original copy as one of reading object is set the A of portion is set; Separate the separation supply unit B that original copy is supplied with from more than ground of set original copy, the original copy of supplying with is once pushed up the neat action of closing, and the original copy after will integrating is drawn the location division C that action is carried in implementation; Make and carry the original copy counter-rotating, make the original copy face towards reading the D of counter-rotating portion that side (below) is carried; First read delivery section E to what the surface image of original copy read from the contact glass below, second read delivery section F, the original copy that read after the completion at the surperficial back side is discharged the outer row's paper G of portion of machine what the original copy back side image after reading read; The H of the portion of piling up with the maintenance of the original copy stow after having read; As the drive division that above-mentioned conveying action is driven pick up motor 101, paper feeding motor 102 reads motor 103; Lifting motor 105 on the base plate, control the controller 100 of above-mentioned a succession of action.
Again, controller 100 is connected with roller clutch 301, roller mobile motor 304.Roller clutch 301 is set the turning power that whether will read motor 103 and is passed to second and read roller 26.Also have, roller mobile motor 304 is configured as required, makes second to read roller 26 and move on axially at it.
A folded original copy 1 that reads places on the document board 2 that contains movable document board 3, with original copy towards last state setting.Again the Width of a folded original copy 1 is carried out the location with the throughput direction vertical direction through side guide piece not shown in the figures.The state that is provided with of original copy by set feeler 4, transducer 5 be set detect, deliver letters to main control section 111 through I/F107.Have again, the original copy length detection transducer 30 or 31 through being provided with on the original copy table top (even use reflection sensor or original copy have only one also can detected power type transducer), judge the substantial distance of the throughput direction of original copy.This transducer must be can judge vertical still horizontal state configuration of same original size at least.
Movable document board 3 constitutes through lifting motor on the base plate 105 and can move up and down along D1, D2 direction among the figure; If by above-mentioned set feeler 4, transducer 5 is set detects original copy is set; Make that lifting motor 105 is just changeing on the base plate; Make movable document board 3 rise, so that make the top of original copy contact with pick-up roller 7.
Paper supply correct position transducer 8 detect base plates rise excessive, make original copy above remain on suitable paper supply height.Above-mentioned paper supply correct position transducer 8 stops base plate and rises when being in on-state, through paper supply repeatedly, the position descends above the original copy; When paper supply correct position transducer 8 becomes off-state; Make base plate rise, paper supply correct position transducer 8 becomes on-state once more, carries out above-mentioned control repeatedly; Thus, the position is remained and be suitable for the paper supply height.
If the whole paper supplies of original copy that are provided with, make that then lifting motor 105 is just changeing on the base plate, make movable document board 3 drop to original position, so that original copy after this can be set.
Pick-up roller 7 is through picking up motor 101, and along D3, the action of D4 direction among the figure, simultaneously, movable document board 3 rises, and receives to push above the original copy on the movable document board 3, rises towards the D3 direction, can upper limit of detection through platform rise detection transducer with cam mechanism.Through body operating portion 108; Specifying duplexmode through pressing button still is after the single face pattern; Push printing key; If send original copy paper supply signal through I/F107 to controller 100 from main control section 111, then pick-up roller 7 picks up many (being desirably 1) original copys on the document board 2 through the just commentaries on classics driven roller revolution of paper feeding motor 102.Gyratory directions is the direction that the original copy of uppermost position in fig-ure is sent to paper feed ports.
At this; When setting duplexmode or single face pattern, both can for the whole original copys that are provided with on the document board 2 (first, second ... N opens) do same setting; Also can (for example do different settings to each original copy; In whole 10 original copys, first and the 10th is made as duplexmode, and all the other are single face pattern etc.).
Paper supply band 9 drives through the paper supply direction that just turns to of paper feeding motor 102, and reverse roll 10 is driven towards the contrary direction revolution of paper supply through 102 just commentaries on classics, separates the original copy and the original copy below it of uppermost position in fig-ure, and only the original copy to uppermost position in fig-ure carries out paper supply.Further explain, reverse roll 10 joins to set pressure with paper supply band 9, when directly joining with paper supply band 9; Perhaps join under the state,, is driven towards counterclockwise turning round along with the revolution of paper supply band 9 through an original copy; When at least two original copys got between paper supply band 9 and the reverse roll 10, the torque of setting drive specific torque limiter was low, and reverse roll 10 is the clockwise direction revolution towards original driving direction; Play the effect that pushes back unnecessary original copy, prevent to send more.
Through the effect of paper supply band 9 and reverse roll 10, the original copy that is separated into is further carried by paper supply band 9, connects transducer 11 detection front ends through bumping; Readvance and run into the asynchronous roller 12 that stops, afterwards, only carry set quantitative distance from bumping the detection that connects transducer 11; Consequently; Have set quantitative deflection at asynchronous roller 12, under the pushing state, stop paper feeding motor 102, stop to drive paper supply band 9.At this moment, make and pick up motor 101 revolution, make pick-up roller 7 above original copy, make a concession, only carry original copy through the carrying capacity of paper supply band, the up-down rollers that the original copy front end gets into asynchronous roller 12 between clamping part, carry out front end and integrate (crooked revisal).
Asynchronous roller 12 has above-mentioned crooked correcting function, simultaneously, is used for after the separation original copy through crooked revisal is delivered to intermediate calender rolls 14, by paper feeding motor 102 inversion driving.At this moment (during paper feeding motor 102 counter-rotatings), asynchronous roller 12 is driven with intermediate calender rolls 14, and pick-up roller 7 is not driven with paper supply band 9.
Master copy width sensor 13 detects the size of the Width vertical with throughput direction of the original copy that is transported by asynchronous roller 12 along a plurality of arrangements of depth direction (with the paper vertical direction).Also have, the length of the throughput direction of original copy is to connect the front and back end that transducer 11 reads original copy through bumping, and detects the length of original copy from motor pulses.
Through the driving of asynchronous roller 12 and intermediate calender rolls 14, C is when the D of counter-rotating portion carries original copy from the location division, and the transporting velocity that is set in location division C realizes shortening the processing time that original copy is sent into reading part than fast in the transporting velocity that reads delivery section E.
If detect the original copy front end by reading inlet transducer 15; The original copy front end entering read the inlet roller 16 up-down rollers between clamping part before; In order to make the original copy transporting velocity and to read transporting velocity, reduce speed now, simultaneously with speed; Motor 103 is read in driving just to be changeed, and drives and reads inlet roller 16, reads outlet roller 23, CIS outlet roller 27.If detect the original copy front end by alignment sensor 17, in the fed distance that sets, slow down, temporarily stop before reading position 20 adjacent, simultaneously, utilize I/F107 to carry the location stop signals to main control section 111.Then,, then locate the original copy that stops and being carried the transporting velocity fixed, arrive up to the original copy front end and read the position to reach by speed-raising if receive the read start signal of sending from main control section 111.By read the motor pulses count detection to the original copy front end arrive time of reading part, main control section 111 is sent the gate signal in the sub scanning direction AP field of first of expression, break away from first reading part until the original copy rear end.
Read single face original copy occasion, be delivered to row's paper G of portion through second reading part through the original copy that reads delivery section E.At this moment, if detect the original copy front end by grate paper-arranaging sensor 24, the row's of driving paper motor 104 is just changeing, and makes exit roller 28 along revolution counterclockwise.Also have; According to grate paper-arranaging sensor 24 from detecting row's paper motor pulses counting that the original copy front end begins; The up-down rollers that will break away from exit roller 28 in the original copy rear end between clamping part before, the row's of making paper motor-driven speed is slowed down, control makes the original copy that is expelled on the discharge tray 29 not jump out.
Reading two sides original copy occasion; Detect after the original copy front end by grate paper-arranaging sensor 24; According to the step-by-step counting of reading motor; When the original copy front end arrived second reading part 25, slave controller 100 broke away from reading part to the gate signal that second reading part 25 sends the AP field of vice scanning direction until the original copy rear end.Second reading part, 25 surfaces are carried out coating and are handled, and are used to prevent be transferred to attached to the pastel on the original copy cause vertical stripe on the read line.Second reads the original copy that roller 26 is suppressed at second reading part 25 floats, and simultaneously, is used for the reference white portion of the shading value data that obtain second reading part.In the present embodiment, read the subtend portion that roller 26 is disposed at second reading part 25 with second, this structure is described.Second read roller 26 the surface have the roughly surface concentration of homogeneous.
Explanation is about the white shading value correcting circuit 41 of image processing circuit 113 below.Fig. 4 is the block diagram of the formation example of the white shading value correcting circuit of expression, and Fig. 5 is the sketch map of handling in the expression averaging circuit.As shown in Figure 4, white shading value correcting circuit 41 makes circuit 42 by the white shading value data as white shading value data implementing device and forms as the white shading value computing circuit 43 of white shading value arithmetic unit.White shading value data make circuit 42 and are made up of averaging circuit 44, peak holding circuit 45,46, register 47, make white shading value data.That is to say, slave controller 100 out gate signal SHGATE, by second reading part 25 read second read roller 26 prescribed limit.
As shown in Figure 4, this view data that reads input averaging circuit 44.In averaging circuit 44, as shown in Figure 5, the capable m piece that is divided into of every L is tried to achieve the capable simple average of L in each piece.That is, try to achieve the simple average value of each pixel value of each line in each piece.Thus, realize the equalization means.This simple average value of trying to achieve is stored in the register 47 as storage device.Thus, realize the storage means.And, ask for the peak value of simple average value of above-mentioned each pixel of trying to achieve of every by peak holding circuit 45.That is, obtain the peak value of main scanning direction of the simple average value of each pixel.
Thus, realize that first peak value calculates means.Then, through peak holding circuit 46, to the every peak value of asking in the peak value that peak holding circuit 45 is tried to achieve.Thus, realize that second peak value calculates means.Then, for the piece that has this peak value, will export white shading value computing circuit 43 as white shading value data to from register 47 by the simple average value that averaging circuit 44 is tried to achieve.Thus, realize the decision means.
Represent with formula if white shading value data are made the processing that circuit 42 carries out, be shown below:
Simple average computing in each piece (being carried out by averaging circuit 44) is undertaken by following formula (1):
Dm(n)＝INT[∑D(n)/L] (1)
Dm (n): the operational data of the n pixel of m piece
Line in the m piece from m*L to (m+1) * L-1
D (n): the reading of data of n pixel
∑ D (n): D (n) from 1 to L capable addition calculated value
Line number in the L:1 piece
INT []: round up below the decimal point
The peak value (being carried out by peak holding circuit 45) that detects in each piece is pressed following formula (2) calculating:
Dmmax＝Dm(n) (2)
Dmmax: the peak value of m piece
Peak value in the detecting gate signal XSHGATE (being carried out by peak holding circuit 46) presses following formula (3) or calculate (4):
Occasion as Dpmax＜Dmmax
Dpmax＝Dmmax (3)
Occasion as Dpmax >=Dmmax
Dpmax＝Dpmax (4)
Peak value in the Dpmax:m piece
First Dpmax=Dmmax
Therefore, the shading value data become the data of the m piece that Dmmax is arranged.
Shading value revisal in that white shading value computing circuit 43 carries out is calculated by following formula (5):
Dsh＝(D(n)/Dp(n))×255 (5)
Dp (n): shading value data
Read second and read the data of all parts of roller 26; Be divided into the m piece and calculate, read roller 26 along the circumferential direction during local pollution when second, do not having contaminated part can generate stable white shading value data; The most at the beginning; Second to read roller 26 be clean, therefore, and can be regardless of which part (piece) to make white shading value data in.But,, obtain the scope stenosis gradually of the peak value of finally asking for (white shading value data) through above-mentioned computing if because original copy friction etc. make second to read roller 26 contaminated words.And, if second read roller 26 a week part all adhere to pollution, the shading value data level of specific pixel is low, the concentration homogeneity can be impaired.
In the present embodiment; Be provided with guiding travel mechanism as the guiding mobile means; Make second read roller 26 edges second reading part 25 vertical with the roller gyratory directions main scanning direction move, when obtaining the shading value data, can obtain the many places data along main scanning direction with same pixel.Therefore, can obtain the shading value data of avoiding the pollution part.
Fig. 6 representes that second reads the formation of roller, and (a) and (b) are plane graphs that the operate condition of roller is read in expression second, (c) are the amplification stereogram of cam part.In the present embodiment, second reads roller 26 has the function as amending plates, and shown in Fig. 6 (a), cis 97 comprises cam part 50 and/or pressure-producing part 51.Cam part 50 comprises movable part 50a and/or fixed part 50b.
In one embodiment of this invention, at one end portion is provided with cam part 50, and the other end is provided with pressure-producing part 51, and it is made up of the helical spring that is used for along the main scanning direction pressurization.Second read roller 26 through roller clutch 301 with read motor 103 and be connected, by driving rotational.And, along with second read roller 26 revolution, the contact condition of cam part 50 changes, the main scanning direction of the relative second reading part material 25 of roller moves back and forth.Pressurization part material 51 reads roller 26 with second and energizes towards cam part 50 directions.Also have, cam part 50 is provided with and is formed on second and reads the end side inclined plane part 50a of roller 26 ends and constitute with the contacted inclined plane part 50b that fixedly contacts of this end side inclined plane part 50a.
End side inclined plane part 50a reads cylinder end that roller 26 1 ends form second and is provided with the inclined-plane and forms, and second reads roller 26 and together turns round.Fixing contact inclined plane part 50b is fixed in device body, is provided with the same inclined plane part with above-mentioned end side inclined plane part 50a.Second reads roller 26 receives pressure-producing part 51 pressurizations, and end side inclined plane part 50a is normal contact with fixedly contacting inclined plane part 50b.If second reads roller 26 revolutions; End side inclined plane part 50a contacts with the inclined plane part that fixedly contacts inclined plane part 50b on one side; Move its contact position on one side; From both inclined plane parts be inclined to consistent state (Fig. 7 (a)), to second read 26 times both inclined plane parts of turnback of roller the summit become contacted state (Fig. 7 (b)), second reads roller 26 only moves size L1 vertically.
And, cam part 50 constitute second read roller 26 roller return and circle, carry out at least 1 time to moving back and forth of main scanning direction, 1/2 all revolution amounts of roller can be guaranteed the full amount of movement along main scanning direction.Return and circle if constitute roller, carry out secondary along the moving back and forth of main scanning direction, then 1/4 of roller all revolution amounts can be guaranteed the full amount of movement along main scanning direction, therefore can shorten the turn-on time of SHGATE.The minimum pixel unit of the relative reading part material 25 of amount of movement L at this moment is taken to few two times of distances, therefore, even if dirt is adhered in the place relative with specific pixel, through moving along main scanning direction, can avoid dirt.
Fig. 7 is the formation of the cis 97A that relates in another embodiment of the present invention of expression; Wherein, Fig. 7 (a) representes the plane graph of the operate condition of this cis 97A, and cis 97A comprises that second reads roller 26; Pressure-producing part 51; Roller mobile motor 304, bearing portion 61, and/or roller drive source 305.Fig. 7 (c) second reads the stereogram of roller 26.This second reads roller 26 and comprises driving shaft 26a.
In the present embodiment, roller mobile motor 304 is used to make and has second of amending plates function and read the drive source that roller 26 moves separately along main scanning direction.Second reads roller 26 is driven by roller drive source 305, and this roller drive source 305 carries out drive controlling through controller 100 respectively with roller mobile motor 304.In addition, replace second and read roller 26, also can utilize roller clutch 301 to read roller 26 by reading motor 103 drivings second by roller drive source 305 driving rotational.
Also have, the bearing portion 61 that roller drive source 305 and second reads roller 26 is connected through thread mechanism, as if roller drive source 305 driving rotational, and the mobile size L2 that advances and retreat vertically of bearing portion 61.According to present embodiment, with embodiment illustrated in fig. 6 the same, under state,, bearing portion 61 is moved along main scanning direction through driven roller mobile motor 304 through the pressurization of direction of pressure-producing part 51 pair rollers, can make second reading get roller 26 and move vertically.Second read roller 26 driving shaft 26a shown in Fig. 7 (c), section roughly becomes the D type, can transmit revolution through moving along thrust direction with the driving of roller drive source 305.
The mobile control of reading roller 26 about second is described below.Fig. 8 is that the flow chart of the mobile control of roller is read in expression second.This example representes to drive the occasion of the example shown in above-mentioned Fig. 6.At step S101, judge whether first original copy, when being first original copy (step S101 " being "); Then get into step S103, roller clutch 301 is made as connection status, making gate signal SHGATE is on-state (step S104); Keep this state, until become roller revolution amount surpass quantitative state, at step S105; Judge that whether roller revolution amount surpasses institute quantitatively, if roller revolution amount surpasses institute's quantitative (step S105 " being "), then gets into step S106; Making gate signal SHGATE is off-state, makes 301 one-tenth dissengaged positionss of roller clutch (step S107).
On the other hand, (step S101 " denying ") then do not get into step S102 when original copy was not first; Whether judgement has original copy at second fetch unit 25; Original copy occasion (step S102 " being ") is arranged, and end process does not then have the occasion (step S102 " denying ") of original copy; Then get into step S103, carry out above-mentioned processing (step S103-S107).According to such processing, only upload first of the original copy put when carrying out paper supply, and between the paper in original copy reads at movable document board 3, when second reading part does not have original copy, just carry out second read roller 26 revolution.
Fig. 9 is the flow chart of second example of the mobile control of expression roller.Control when this example representes to use shown in Figure 7 second to read roller 26.At step S201, judge whether first original copy, when being first original copy (step S201 " being "); Then get into step S203; Read roller 26 through reading motor 103 drivings second, make roller clutch 301 be made as dissengaged positions, then; At step S204, confirm the gyratory directions sign of decision advance and retreat direction.If gyratory directions is masked as on-state (step S204 " being "), then get into step S205, roller mobile motor 304 is just being changeed, then; At step S206, make that gate signal SHGATE is an on-state, simultaneously, at step S207; Make gyratory directions be masked as off-state, keep this state, until become roller revolution amount surpass quantitative state; At step S211, judge that whether roller revolution amount surpasses institute quantitatively, if roller revolution amount surpasses institute's quantitative (step S211 " being "); Then get into step S212, making gate signal SHGATE is off-state, and making the roller mobile motor is that the roller drive source becomes off-state (step S213).
On the other hand,, then get into step S208, roller mobile motor 304 is reversed if gyratory directions is masked as off-state (step S204 " denying "); Then, at step S209, make that gate signal SHGATE is an on-state; Simultaneously, at step S210, make gyratory directions be masked as on-state.Keep this state; Until become roller revolution amount surpass quantitative state, at step S211, judge whether roller revolution amount surpasses institute quantitatively; If roller revolution amount surpasses institute's quantitative (step S211 " being "); Then get into step S212, making gate signal SHGATE is off-state, and making the roller mobile motor is that the roller drive source becomes off-state (step S213).
Again, (step S201 " denying ") then do not get into step S202 when original copy was not first; Whether judgement has original copy at second fetch unit 25; Original copy occasion (step S202 " being ") is arranged, and end process does not then have the occasion (step S202 " denying ") of original copy; Then get into step S203, carry out above-mentioned processing (step S203-S213).According to such processing, only upload first of the original copy put when carrying out paper supply, and between the paper in original copy reads at movable document board 3, when second reading part does not have original copy, just carry out second read roller 26 revolution.
Also have, when movable document board 3 being uploaded first of the original copy of putting and carry out paper supply, or between the paper in original copy reads (when second reading part does not have original copy), can carry out second through the driven roller mobile motor and read roller 26 moving along main scanning direction.The revolution amount of roller mobile motor at this moment be made as with roller along main scanning direction decide the suitable amount of amount of movement, each returns conversion rev direction.Cut off the revolution of roller through roller clutch 301, can only carry out the moving along main scanning direction of roller separately.
Figure 10 is the flow chart of the 3rd example of the mobile control of expression roller.Control when this example is represented to use shown in Figure 7 second to read roller 26.At step S301, judge whether first original copy, when being first original copy (step S301 " being "); Then get into step S303; Read roller 26 through reading motor 103 drivings second, make roller clutch 301 be made as dissengaged positions, then; At step S304, confirm the gyratory directions sign of decision advance and retreat direction.If gyratory directions is masked as on-state (step S304 " being "), then get into step S305, roller mobile motor 304 is just being changeed, then; At step S306, make that gate signal SHGATE is an on-state, simultaneously, at step S307; Make gyratory directions be masked as off-state, keep this state, until become roller revolution amount surpass quantitative state, at step S311; Judge that whether roller revolution amount surpasses institute quantitatively, if roller revolution amount surpasses institute's quantitative (step S311 " being "), then gets into step S312; Making gate signal SHGATE is off-state, and making the roller mobile motor is that the roller drive source becomes off-state (step S313), breaks off roller clutch (step S314).
On the other hand,, then get into step S308, roller mobile motor 304 is reversed if gyratory directions is masked as off-state (step S304 " denying "); Then, at step S309, make that gate signal SHGATE is an on-state; Simultaneously, at step S310, make gyratory directions be masked as on-state.Keep this state, until become roller revolution amount surpass quantitative state, at step S311; Judge whether roller revolution amount surpasses institute quantitatively; If roller revolution amount surpasses institute's quantitative (step S311 " being "), then get into step S312, making gate signal SHGATE is off-state; Making the roller mobile motor is that the roller drive source becomes off-state (step S313), breaks off roller clutch (step S314).
Again, (step S301 " denying ") then do not get into step S302 when original copy was not first; Whether judgement has original copy at second fetch unit 25; Original copy occasion (step S302 " being ") is arranged, and end process does not then have the occasion (step S302 " denying ") of original copy; Then get into step S303, carry out above-mentioned processing (step S303-S314).According to such processing, can cut off the driving transmission of reading motor through roller clutch 301, can make second reading get roller 26 reads roller 26 along the mobile of main scanning direction and second revolution driving interlock.
As above state bright; According to the present invention; When obtaining a plurality of shading value data, can use guiding means to move, therefore along the main scanning direction and the sub scanning direction of read means with amending plates function; Even dirt is adhered in guiding means part, also can obtain the shading value data not being stained with the dirt place.
Also have, according to the present invention, the guiding means are to have the roughly roller of homogeneous surface concentration, therefore, can make the roller revolution, read the surface in the place of not adhering to dirt, generate the shading value data.
Also have, according to the present invention, the guiding means can be followed the roller revolution in the limit, and the edge main scanning direction moves, and therefore, even adhere to dirt at the circumferencial direction on the surface of roller, also can not have contaminated place to obtain the shading value data.
Also have, according to the present invention, above-mentioned guiding means are made as base resolution 1 point of relative read means along the amount of movement of main scanning direction, and therefore at least 2 times of distances, can avoid pollution really.
Also have, according to the present invention, above-mentioned guiding means follow rotating moving, when beginning to carry first of set original copy, carry out, therefore, can reduce consumes electric power, suppress influence to the original copy transportation performance.
Also have, according to the present invention, the guiding means to follow rotating moving be between the paper that reads successively while carrying, to carry out, do not damage reading efficiency, can generate the shading value data of pollution-free influence to every original copy.
Also have, according to the present invention, can independent mutually control as moving of the revolution of the roller of guiding means and above-mentioned guiding means, therefore, can select to follow mobile revolution and not follow mobile revolution, improve the degree of freedom that the original copy supply is controlled.
Also have,, when beginning to carry set original copy a piece of paper, above-mentioned guiding means are moved separately along main scanning direction, therefore, can reduce noise and consumes electric power according to the present invention.
Also have, according to the present invention, when beginning to carry set original copy a piece of paper; Can make above-mentioned guiding means move the revolution of following roller along main scanning direction carries out; Therefore, even roller surface circumferencial direction adheres to the dirt occasion, can there be contaminated place to obtain the shading value data yet.
Also have, according to the present invention, be provided with control device, when reading the paper epigraph; Do not carry out above-mentioned roller along the moving of main scanning direction, only carry out the revolution of roller, therefore, can be when reading images; Moving of the means that do not lead carried original copy, can improve the image reading quality.
Also have, according to the present invention, the guiding means are dull and stereotyped guides; White plates part by moving at the main scanning direction of read means constitutes, therefore, even follow original copy to carry; Dirt is adhered in guiding means part, also can not have contaminated place to obtain the shading value data.
Also have, according to the present invention, through image read-out of the present invention is applicable to auto document feeder, can be at a high speed and the image that carries out two-sided original reliably read.
And, above-mentioned auto document feeder is applicable to image processing system, can be at a high speed and the image that carries out two-sided original reliably reads, image is carried, image duplicates output.
Above with reference to description of drawings example of the present invention, but the present invention is not limited to above-mentioned example.In technological thought scope of the present invention, can do all changes, they all belong to protection scope of the present invention.

Claims (14)

1. an image read-out is characterized in that, comprising:
Read means, fixed configurations are used to read the paper of carrying in device body;
The guiding means with this read means subtend configuration, support, and make the above-mentioned relatively read means of above-mentioned paper be configured in correct position;
The guiding mobile means, the main scanning direction of the above-mentioned read means in edge drives above-mentioned guiding means, makes above-mentioned guiding means move relative to above-mentioned read means;
The guiding rotary tool makes the above-mentioned guiding means edge sub scanning direction vertical with main scanning direction turn round;
Controller is controlled above-mentioned read means, and scanning is moved by above-mentioned guiding mobile means and by not the existing together of the rotating guiding means of above-mentioned guiding rotary tool, generated the shading value data.
2. image read-out according to claim 1 is characterized in that:
Above-mentioned guiding means comprise the datum plate by read means scanning, so that generate the shading value data.
3. image read-out according to claim 1 and 2 is characterized in that:
Above-mentioned guiding means are the roller shape parts with surface concentration of homogeneous.
4. image read-out according to claim 3 is characterized in that:
Above-mentioned guiding mobile means makes above-mentioned guiding means move along main scanning direction, and above-mentioned guiding rotary tool makes above-mentioned guiding means turn round along sub scanning direction.
5. image read-out according to claim 4 is characterized in that:
Above-mentioned guiding mobile means makes above-mentioned guiding means along the amount of movement of main scanning direction, is at least 2 times amount of the minimum pixel unit of above-mentioned read means.
6. image read-out according to claim 5 is characterized in that:
When first of set plurality of sheets of paper opens the beginning when carrying, above-mentioned guiding mobile means makes above-mentioned guiding means move along main scanning direction.
7. image read-out according to claim 4 is characterized in that:
Above-mentioned guiding mobile means makes the interval of moving between many paper that transports and read in proper order of above-mentioned guiding means carry out.
8. image read-out according to claim 7 is characterized in that:
The above-mentioned controller rotary tool of control guiding independently respectively makes above-mentioned guiding means make above-mentioned guiding means move along main scanning direction along sub scanning direction revolution and control guiding mobile means.
9. image read-out according to claim 8 is characterized in that:
When first of set plurality of sheets of paper opens the beginning when carrying, above-mentioned controller control makes above-mentioned guiding mobile means separate with the guiding rotary tool, makes above-mentioned guiding means move along main scanning direction.
10. image read-out according to claim 8 is characterized in that:
When first of set plurality of sheets of paper opens the beginning when carrying, above-mentioned controller is controlled above-mentioned guiding mobile means makes above-mentioned guiding means move along main scanning direction, and simultaneously, these guiding means are by guiding rotary tool driving rotational.
11. image read-out according to claim 8 is characterized in that:
When read means read the paper epigraph, above-mentioned controller control guiding rotary tool made above-mentioned guiding means turn round along sub scanning direction, and the guiding mobile means does not make above-mentioned guiding means move along main scanning direction;
Above-mentioned controller control makes above-mentioned guiding mobile means separate with the guiding rotary tool, and above-mentioned guiding mobile means makes the interval of moving between many paper that transports and read in proper order of above-mentioned guiding means carry out.
12. image read-out according to claim 8 is characterized in that:
When read means read the paper epigraph, above-mentioned controller control guiding rotary tool made above-mentioned guiding means turn round along sub scanning direction, and the guiding mobile means does not make above-mentioned guiding means move along main scanning direction;
Above-mentioned controller is controlled above-mentioned guiding mobile means makes above-mentioned guiding means move along main scanning direction, and carry out at the interval between many paper that transports and read in proper order, and simultaneously, these guiding means are by guiding rotary tool driving rotational.
13. an auto document feeder is characterized in that:
Be provided with any described image read-out among the aforesaid right requirement 1-12.
14. an image processing system is characterized in that:
Be provided with the auto document feeder described in the aforesaid right requirement 13.
CN200910159668XA 2008-07-30 2009-07-29 Image reader, auto document feeder, and image forming apparatus Expired - Fee Related CN101640751B (en)

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